lowks@robot-ng4 ~/Downloads/tmuxp $ tmuxp load ~/.tmuxp/editing.json 
load /home/lowks/.tmuxp/editing.json
(I) [10:11:37] tmuxp.cli cli.load_workspace():256 Loading /home/lowks/.tmuxp/editing.json.
Traceback (most recent call last):
  File "/usr/local/bin/tmuxp", line 9, in <module>
    load_entry_point('tmuxp==0.1.0rc1', 'console_scripts', 'tmuxp')()
  File "/usr/local/lib/python2.7/dist-packages/tmuxp/cli.py", line 977, in main
    command_load(args)
  File "/usr/local/lib/python2.7/dist-packages/tmuxp/cli.py", line 435, in command_load
    load_workspace(file_cwd, args)
  File "/usr/local/lib/python2.7/dist-packages/tmuxp/cli.py", line 278, in load_workspace
    builder.build()
  File "/usr/local/lib/python2.7/dist-packages/tmuxp/workspacebuilder.py", line 138, in build
    for p in self.iter_create_panes(w, wconf):
  File "/usr/local/lib/python2.7/dist-packages/tmuxp/workspacebuilder.py", line 219, in iter_create_panes
    assert int(p.get('pane_index')) == int(pane_base_index + pindex)
AssertionError
lowks@robot-ng4 ~/Downloads/tmuxp $ tmuxp load ~/.tmuxp/editing.json 
load /home/lowks/.tmuxp/editing.json
(I) [10:11:44] tmuxp.cli cli.load_workspace():256 Loading /home/lowks/.tmuxp/editing.json.
Session name 2-pane-vertical is already running. Attach? [Y/n] y